Electrode assembly and electrode assembly processing method

Abstract

The application discloses an electrode assembly and an electrode assembly processing method. The electrode assembly processing method comprises the following steps: preparing a liquid supplement assembly; wherein the liquid supplement assembly comprises a cylindrical shell, an electrolyte arranged in the shell, and a first liquid guide arranged in the shell, the first liquid guide can guide the electrolyte in the shell out of the shell by using the capillary flow phenomenon; and the first diaphragm, the first electrode, the second diaphragm and the second electrode are all wound outside the peripheral wall of the shell to form a cylindrical electrode assembly. The scheme can reduce the assembly action of the liquid supplement assembly, and can also make the connection between the peripheral shell and the winding core more close, so that the internal space of the winding core is maximized, and the containing space of the electrolyte in the liquid supplement assembly is improved, and the cycle performance of the battery is improved.

Description

Technical Field

[0001] This invention relates to the field of new energy, and in particular to an electrode assembly and a method for processing the electrode assembly. Background Technology

[0002] Lithium-ion batteries are widely used in various digital products, mobile devices, and power tools due to their advantages such as high energy density, low self-discharge, wide operating temperature range, and no environmental pollution. Cylindrical lithium-ion batteries, as a traditional battery structure, occupy an important position in many application fields. In energy storage and power applications, stringent requirements are placed on battery safety and cycle life. Balancing safety and improving the cycle life of cylindrical lithium-ion batteries has become a challenge in the industry.

[0003] Commercial cylindrical lithium-ion batteries employ a process of electrolyte injection followed by sealing. Due to their structure and manufacturing process, adding too much electrolyte increases side reaction gas production, thus increasing internal pressure and potentially triggering the explosion-proof valve to open under non-abuse conditions, because the cylindrical battery undergoes sealing before formation. The increased side reactions from excess electrolyte also lead to decreased battery safety. Conversely, adding too little electrolyte, while solving the above problems, causes cycle failure in the later stages of lithium-ion battery cycling due to electrolyte deficiency. Current technology cannot completely resolve these contradictions. Summary of the Invention

[0004] The main objective of this invention is to provide an electrode assembly and an electrode assembly processing method that can improve battery safety while maintaining a long battery life.

[0005] To achieve the above objectives, the present invention proposes an electrode assembly processing method, comprising the following steps:

[0006] Prepare a liquid replenishment assembly; wherein the liquid replenishment assembly includes a cylindrical shell, an electrolyte disposed within the shell, and a first conductive liquid penetrating the shell, the first conductive liquid being able to exhaust the electrolyte from the shell through the shell by means of capillary conduction;

[0007] The first diaphragm, the first electrode, the second diaphragm, and the second electrode are all wound around the periphery of the housing to form a cylindrical electrode assembly.

[0008] In some embodiments, the step of preparing the fluid replenishment component includes:

[0009] A cylindrical shell is prepared; wherein one end of the shell is sealed and the other end is open;

[0010] A first plug body is prepared; wherein the first plug body has an opening;

[0011] Prepare a first conductive liquid, and make the first conductive liquid pass through the opening on the first plug body;

[0012] Electrolyte is injected into the housing, and the first plug is used to seal the open port of the housing, so that one end of the first conductive liquid is immersed in the electrolyte and the other end extends out of the housing.

[0013] In some embodiments, the step of preparing the fluid replenishment component includes:

[0014] A cylindrical shell is prepared, wherein both ends of the shell are open;

[0015] A first plug and a second plug are prepared; wherein both the first plug and the second plug are provided with openings;

[0016] A first conductive liquid and a second conductive liquid are prepared, wherein the first conductive liquid passes through an opening in the first plug body, and the second conductive liquid passes through an opening in the second plug body, wherein the second conductive liquid can guide the electrolyte by means of capillary conduction.

[0017] The first plug is used to seal one end of the housing;

[0018] Electrolyte is injected into the housing, and the second plug is used to seal the other end of the housing, so that one end of the first conductive liquid is immersed in the electrolyte and the other end extends out of the housing, and one end of the second conductive liquid is immersed in the electrolyte and the other end extends out of the housing.

[0019] In some embodiments, prior to the step of winding the first diaphragm, the first electrode, the second diaphragm, and the second electrode around the peripheral wall of the housing to form a cylindrical electrode assembly, the following step is further included:

[0020] The first diaphragm or the second electrode is adhered to the peripheral wall of the housing.

[0021] A second aspect of this application also provides a method for processing an electrode assembly, comprising the following steps:

[0022] Prepare a cylindrical shell and insert a rotating shaft through the shell;

[0023] The first diaphragm or the second electrode is bonded to the peripheral wall of the housing;

[0024] The rotating shaft is rotated, which in turn drives the housing to rotate, so that the first diaphragm, the first electrode, the second diaphragm, and the second electrode are all wrapped around the periphery of the housing.

[0025] This causes the rotating shaft to detach from the housing.

[0026] In some embodiments, the housing is closed at one end and open at the other. After the step of disengaging the rotating shaft from the housing, the following step is further included:

[0027] A first plug body is prepared; wherein the first plug body has an opening;

[0028] A first conductive liquid is prepared, which is then inserted through an opening in the first plug body. The first conductive liquid can guide the electrolyte through capillary conduction.

[0029] Electrolyte is injected into the housing, and the first plug is used to seal the open opening of the housing, so that one end of the first liquid conductor is immersed in the electrolyte and the other end extends out of the housing.

[0030] In some embodiments, after the step of disengaging the rotating shaft from the housing, the following step is further included:

[0031] A first plug and a second plug are prepared; wherein both the first plug and the second plug are provided with openings;

[0032] A first conductive liquid and a second conductive liquid are prepared, wherein the first conductive liquid passes through an opening in the first plug body, and the second conductive liquid passes through an opening in the second plug body. The first conductive liquid can guide the electrolyte by means of capillary conduction, and the second conductive liquid can guide the electrolyte by means of capillary conduction.

[0033] The first plug is used to seal one end of the housing;

[0034] Electrolyte is injected into the housing, and the second plug is used to seal the other end of the housing, so that one end of the first conductive liquid is immersed in the electrolyte and the other end extends out of the housing, and one end of the second conductive liquid is immersed in the electrolyte and the other end extends out of the housing.

[0035] In some embodiments, the conduction rate of the first conductive liquid is 0.1 g / month to 2.0 g / month; the conduction rate of the second conductive liquid is 0.1 g / month to 2.0 g / month.

[0036] A third aspect of this application also provides an electrode assembly manufactured using any of the above-described processing methods, the electrode assembly comprising:

[0037] A liquid replenishment assembly includes a housing, an electrolyte, and a first liquid conductor. The housing defines a liquid replenishment chamber, the electrolyte is contained in the liquid replenishment chamber, and one end of the first liquid conductor extends into the liquid replenishment chamber and the other end extends out of the housing.

[0038] The core includes a first diaphragm, a first electrode, a second diaphragm, and a second electrode, and the core is wound around the peripheral wall of the housing;

[0039] The first liquid guide is configured to use capillary flow to draw electrolyte out of the replenishment chamber.

[0040] In some embodiments, the size of the housing is equal to the size of the core along the direction of the winding axis of the core.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] In the technical solution of this invention, a liquid replenishment component is provided, which contains electrolyte. The liquid replenishment component then guides the electrolyte out through a liquid guide. When the battery has the electrode assembly of this solution, since the electrolyte in the liquid replenishment component does not directly participate in the reaction, the amount of electrolyte that can directly participate in the reaction inside the battery is reduced, thereby reducing the amount of gas generated after the reaction, lowering the internal gas pressure of the battery, and thus improving the battery's safety performance. Furthermore, since the liquid guide can gradually remove the electrolyte from the liquid replenishment component, when the battery has been used for a long time and exhibits phenomena similar to lithium plating, the electrolyte that can directly participate in the reaction inside the battery is replenished, thereby improving the battery's cycle life. In addition, in this solution, the liquid replenishment component is located inside the core (the core includes a first separator, a first electrode, a second separator, and a second electrode), making reasonable use of the internal space of the core, thereby reducing the overall volume of the battery.

[0043] Specifically, in the processing method of this application, the core is directly wound onto the outer shell of the electrolyte replenishment assembly before winding, i.e., the first diaphragm, the first electrode, the second diaphragm, and the second electrode are directly wound onto the outer shell. Compared to the processing method where the core is first wound and then the outer shell is placed inside the core, this method reduces the assembly steps of the electrolyte replenishment assembly and allows for a tighter connection between the outer shell and the core, thereby maximizing the utilization of the core's internal space. This, in turn, increases the electrolyte capacity within the electrolyte replenishment assembly and improves the battery's cycle performance. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0045] Figure 1 This is a three-dimensional schematic diagram of the core in one embodiment of the present invention;

[0046] Figure 2 This is a cross-sectional schematic diagram of an electrode assembly according to an embodiment of the present invention;

[0047] Figure 3 This is a cross-sectional schematic diagram of a liquid replenishment component in one embodiment of the present invention; wherein, the electrolyte is omitted.

[0048] Figure 4 This is a cross-sectional schematic diagram of the liquid replenishment component in another embodiment of the present invention; wherein, the electrolyte is omitted.

[0049] Figure 5 This is a flowchart of an electrode assembly processing method according to an embodiment of the present invention;

[0050] Figure 6 This is a flowchart of an electrode assembly processing method according to another embodiment of the present invention.

[0051] Explanation of icon numbers:

[0052] 100 - Electrode assembly;

[0053] 110 - Core; 111 - Channel;

[0054] 120 - Liquid replenishment assembly; 121 - Housing; 1211 - Outer periphery shell; 1212 - First plug; 1213 - Second plug; 122 - Electrolyte; 123 - First liquid conductor; 124 - Second liquid conductor; 125 - Liquid replenishment chamber.

[0055] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0057] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0058] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or," "and / or," or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0059] Lithium-ion batteries are widely used in various digital products, mobile devices, and power tools due to their advantages such as high energy density, low self-discharge, wide operating temperature range, and no environmental pollution. Cylindrical lithium-ion batteries, as a traditional battery structure, occupy an important position in many application fields. In energy storage and power applications, stringent requirements are placed on battery safety and cycle life. Balancing safety and improving the cycle life of cylindrical lithium-ion batteries has become a challenge in the industry.

[0060] Commercial cylindrical lithium-ion batteries employ a process of electrolyte injection followed by sealing. Due to their structure and manufacturing process, adding too much electrolyte increases the risk of side reactions and gas production, increasing internal pressure and potentially triggering the explosion-proof valve to open under non-abuse conditions. This increased side reactions also reduce battery safety. Conversely, adding too little electrolyte, while mitigating these issues, can lead to cycle failure in later stages of lithium-ion battery life due to electrolyte deficiency. In other words, a high initial electrolyte level can generate excessive gas during reactions, increasing internal pressure and creating safety hazards. Conversely, a low initial electrolyte level weakens the battery's cycle performance.

[0061] In view of this, see Figure 1-4 An embodiment of the present invention provides an electrode assembly 10, which includes a core 110 and a liquid replenishment assembly 120.

[0062] The core 110 includes a first electrode, a second electrode, a first separator, and a second separator. The first separator, the first electrode, the second separator, and the second electrode are sequentially stacked and then wound into shape. After being formed, the core 110 defines an internal channel 111, and the core 110 is arranged around the channel 111. The core 110 can be cylindrical (in which case the core 110 functions as a cylindrical battery) or flat (in which case the core 110 functions as a square battery). For ease of description, the following explanation uses a cylindrical core 110 as an example. When the core 110 is cylindrical, its internal channel 111 is cylindrical.

[0063] The liquid replenishment assembly 120 is disposed within the channel 111 of the winding core 110. The liquid replenishment assembly 120 includes a housing 121, an electrolyte 122, and a first liquid guide 123. The housing 121 defines a liquid replenishment chamber 125, in which the electrolyte 122 is contained. One end of the first liquid guide 123 extends into the liquid replenishment chamber 125, and the other end extends out of the housing 121. The shape of the housing 121 depends on actual needs; it only needs to be able to contain the electrolyte 122 and allow the first liquid guide 123 to pass through. The first liquid guide 123 is configured to use capillary conduction to guide the electrolyte 122 out of the liquid replenishment chamber 125. In the above scheme, the portion of the first conductive liquid 123 located within the replenishment chamber 125 can contact the electrolyte 122 within the replenishment chamber 125. Therefore, the first conductive liquid 123 can absorb the electrolyte 122 within the replenishment chamber 125 through capillary action and can export the absorbed electrolyte 122 to the outside of the casing 121. When the electrode assembly 10 is used in the battery, the first conductive liquid 123 can export the absorbed electrolyte 122 to the reaction chamber within the battery for reaction. Furthermore, when the electrode assembly 10 is used in the battery, the electrolyte 122 within the replenishment chamber 125 is isolated from the electrolyte 122 used for reaction within the battery. Therefore, the electrolyte 122 within the replenishment chamber 125 is difficult to participate in the reaction. The electrolyte 122 within the replenishment chamber 125 can only react after being exported by the first conductive liquid 123 to the outside of the replenishment assembly 120 (and located inside the battery).

[0064] In the technical solution of this invention, a liquid replenishment component 120 is provided, and an electrolyte 122 is disposed within the liquid replenishment component 120. The liquid replenishment component 120 also guides the electrolyte 122 out through a liquid guide. When the battery has the cell assembly of this solution, since the electrolyte 122 within the liquid replenishment component 120 does not directly participate in the reaction, the amount of electrolyte 122 that can directly participate in the reaction inside the battery is reduced, thereby reducing the amount of gas generated after the reaction, lowering the internal gas pressure of the battery, and thus improving the battery's safety performance. Furthermore, since the liquid guide can gradually guide the electrolyte 122 out of the liquid replenishment component 120, when the battery has been used for a long time and exhibits phenomena similar to lithium plating, the amount of electrolyte 122 that can directly participate in the reaction inside the battery is replenished, thereby improving the battery's cycle life. In addition, in this solution, the liquid replenishment component 120 is disposed inside the winding core 110, making reasonable use of the internal space of the winding core 110, thereby reducing the overall volume of the battery.

[0065] When the rate at which the electrolyte 122 is discharged from the replenishment chamber 125 within the replenishment component 120 is too fast, the amount of electrolyte 122 directly involved in the reaction within the battery increases, leading to more gas production after the electrolyte 122 reacts, thus relatively increasing the risk to the battery. Conversely, when the rate at which the electrolyte 122 is discharged from the replenishment chamber 125 within the replenishment component 120 is too slow, the battery's cycle performance decreases. Therefore, the discharge rate of the electrolyte 122 within the component must be neither too fast nor too slow. To achieve this, extensive experimental verification has shown that when the discharge rate of the first liquid conductor 123 is controlled between 0.1 g / month and 2.0 g / month, the discharge rate of the electrolyte 122 within the replenishment chamber 125 meets practical requirements. Specifically, the conduction rate of the first conductive liquid 123 can be 0.1 g / month, 0.3 g / month, 0.6 g / month, 0.9 g / month, 1 g / month, 1.5 g / month, or 2 g / month, etc.

[0066] See Figure 2-3 In some embodiments, the outer peripheral wall of the housing 121 is cylindrical, and the length of the housing 121 along the axial direction of the channel 111 is equal to the length of the channel 111 along the axial direction. This design allows the shape of the replenishing component 120 to be adapted to the shape of the core 110, thereby maximizing the volume of the replenishing component 120 without increasing the overall volume of the electrode assembly 10, thus increasing the amount of electrolyte 122 contained within the replenishing component 120.

[0067] The housing 121 of the liquid replenishment assembly 120 can be interference-fitted, clearance-fitted, or transition-fitted with the core 110. Specifically, in this embodiment, the housing 121 of the liquid replenishment assembly 120 is clearance-fitted with the core 110, thereby reducing the assembly difficulty between the housing 121 and the core 110.

[0068] The first liquid guide 123 can be inserted at any position in the housing 121, see [reference]. Figure 2-3 In some embodiments, the first liquid guide 123 includes a first end and a second end, which are arranged opposite to each other along the axial direction of the channel 111. The first liquid guide 123 passes through the first end. In this design, compared to a structure where the first liquid guide 123 exits through the peripheral wall of the housing 121, the gap between the housing 121 and the core 110 can be reduced, allowing the volume of the housing 121 to be larger, thereby further increasing the amount of electrolyte 122 contained in the replenishment assembly 120.

[0069] See Figure 3 In some embodiments, the housing 121 includes an outer peripheral shell 1211 and a first plug 1212. One end of the outer peripheral shell 1211 along the axial direction of the channel 111 is closed, and the other end of the outer peripheral shell 1211 along the axial direction of the channel 111 has a first opening. The first plug 1212 covers the first opening, and a first conductive liquid 123 passes through the first plug 1212. This design facilitates the injection of electrolyte 122 into the housing 121, thereby reducing the processing difficulty of the housing 121. Specifically, the first plug 1212 can be made of a flexible material, for example, rubber or silicone.

[0070] See Figure 4 In some embodiments, the replenishment assembly 120 further includes a second liquid guide 124, one end of which extends into the replenishment chamber 125, and the other end passes through the second end. The second liquid guide 124 is configured to use capillary conduction to drain the electrolyte 122 from the replenishment chamber 125. The material of the second liquid guide 124 can be the same as that of the first liquid guide 123, differing only in their arrangement. Specifically, the replenishment assembly 120 may also include multiple first liquid guides 123 and multiple second liquid guides 124. For example, the replenishment assembly 120 includes two first liquid guides 123, both of which are arranged at the first end of the housing 121. The replenishment assembly 120 also includes two second liquid guides 124, both of which are arranged at the second end of the housing 121.

[0071] Similarly, in some embodiments, the conduction rate of the first liquid conductor 123 can be controlled between 0.1 g / month and 2.0 g / month, which ensures that the outflow rate of the electrolyte 122 in the replenishment chamber 125 meets actual requirements. Specifically, the conduction rate of the first liquid conductor 123 can be 0.1 g / month, 0.3 g / month, 0.6 g / month, 0.9 g / month, 1 g / month, 1.5 g / month, or 2 g / month, etc.

[0072] See Figure 4In some embodiments, the housing 121 includes an outer peripheral shell 1211, a first plug 1212, and a second plug 1213. The outer peripheral shell 1211 has a first opening at one end along the axial direction of the channel 111, and a second opening at the other end along the axial direction of the channel 111. The first plug 1212 covers the first opening, and a first liquid 123 exits through the first plug 1212. The second plug 1213 covers the second opening, and a second liquid 124 exits through the second plug 1213. The second plug 1213 may be made of the same material as the first plug 1212, differing only in their arrangement.

[0073] The applicant considered that, after the core 110 is wound, the outer peripheral shell 121 of the liquid replenishment assembly 120 may damage the core 110 during the insertion of the core 110 into its center. To solve this problem, see [reference needed]. Figure 5-6 The following provides a method for processing an electrode assembly 100, which is capable of processing such as... Figure 1-4 The electrode assembly 100 is shown. See also... Figure 5 The electrode assembly 100 processing method includes the following steps:

[0074] S101: Prepare the liquid replenishment component 120. The liquid replenishment component 120 includes a cylindrical outer shell 121, an electrolyte 122 disposed within the outer shell 121, and a first conductive liquid 123 penetrating the outer shell 121. The first conductive liquid 123 can use capillary conduction to guide the electrolyte 122 out of the outer shell 121.

[0075] S102: The first diaphragm, the first electrode, the second diaphragm, and the second electrode are all wound around the peripheral wall of the outer shell 121 to form a cylindrical electrode assembly 100.

[0076] In the above processing method, the liquid replenishment assembly 120 is assembled with the core 110 before the core 110 is wound. In existing core 110 processing, the core 110 is wound around a rotating shaft. In this processing method, the core 110 (including the first diaphragm, the first electrode, the second diaphragm, and the second electrode) is directly wound around the outer peripheral shell 121. Specifically, the liquid replenishment assembly 120 can be fixed to the rotating shaft first, and then the liquid replenishment assembly 120 can be driven to rotate, so that the core 110 is wound around the peripheral wall of the outer peripheral shell 121 of the rotating shaft. Compared to the processing method of first winding the core 110 and then placing the outer shell 121 inside the core 110, this method reduces the assembly of the electrolyte replenishment assembly 120 and makes the connection between the outer shell 121 and the core 110 tighter, thereby maximizing the use of the internal space of the core 110. This, in turn, increases the capacity of the electrolyte 122 in the electrolyte replenishment assembly 120 and improves the cycle performance of the battery.

[0077] In the above method, preferably, the outer shell 121 of the liquid replenishment component 120 and the core 110 can be interference-fitted, thereby increasing the arrangement space of the liquid replenishment component 120.

[0078] In some embodiments, the step of preparing the fluid replenishment assembly 120 includes:

[0079] A columnar outer shell 121 is prepared; wherein, the outer shell 121 is sealed at one end and open at the other end.

[0080] A first plug body 1212 is prepared; wherein, the first plug body 1212 is provided with an opening.

[0081] Prepare a first conductive liquid 123, and make the first conductive liquid 123 pass through the opening on the first plug 1212.

[0082] Electrolyte 122 is injected into the outer shell 121, and the first plug 1212 seals the open port of the outer shell 121, so that one end of the first liquid conductor 123 is immersed in the electrolyte 122 and the other end extends out of the outer shell 121.

[0083] The above processing method is applicable to processing products such as Figure 3 The electrode assembly 100.

[0084] In some embodiments, the step of preparing the fluid replenishment assembly 120 includes:

[0085] A columnar outer shell 121 is prepared; wherein the outer shell 121 is open at both ends.

[0086] A first plug body 1212 and a second plug body 1213 are prepared; wherein, both the first plug body 1212 and the second plug body 1213 are provided with openings.

[0087] A first conductive liquid 123 and a second conductive liquid 124 are prepared such that the first conductive liquid 123 passes through an opening in the first plug body 1212 and the second conductive liquid 124 passes through an opening in the second plug body 1213. The second conductive liquid 124 can conduct electrolyte 122 by utilizing capillary conduction.

[0088] The first plug 1212 seals one end of the outer peripheral shell 121.

[0089] Electrolyte 122 is injected into the outer shell 121, and the other end of the outer shell 121 is sealed with the second plug 1213, so that one end of the first liquid conductor 123 is immersed in the electrolyte 122 and the other end extends out of the outer shell 121, and one end of the second liquid conductor 124 is immersed in the electrolyte 122 and the other end extends out of the outer shell 121.

[0090] This processing method is suitable for processing such as Figure 4The electrode assembly 100 shown.

[0091] In some embodiments, prior to the step of winding the first diaphragm, the first electrode, the second diaphragm, and the second electrode around the peripheral wall of the outer peripheral shell 121 to form a cylindrical electrode assembly 100, the following step is further included:

[0092] The first diaphragm or the second electrode is bonded to the peripheral wall of the outer shell 121.

[0093] In this design, if the core 110 consists of a second electrode, a second diaphragm, a first electrode, and a first diaphragm from the outside in, the first diaphragm can be bonded to the peripheral wall of the outer shell 121. If the core 110 consists of a first diaphragm, a first electrode, a second diaphragm, and a second electrode from the outside in, the second electrode can be bonded to the peripheral wall of the outer shell 121. This processing method makes the connection between the liquid replenishment assembly 120 and the core 110 more reliable.

[0094] See Figure 6 This application also provides a method for processing an electrode assembly 100, including the following steps:

[0095] S201: Prepare a columnar outer shell 121 and make the rotating shaft pass through the outer shell 121.

[0096] S202: Adhere the first diaphragm or the second electrode to the peripheral wall of the outer shell 121.

[0097] S203: Rotate the shaft and drive the outer peripheral shell 121 to rotate, so that the first diaphragm, the first electrode, the second diaphragm, and the second electrode are all wrapped around the peripheral wall of the outer peripheral shell 121.

[0098] S204: Disengage the shaft from the outer casing 121.

[0099] In the above scheme, the replenishing component 120 is not fully pre-formed. Instead, the core 110 is first wound around the outer wall of the outer shell 121 of the replenishing component 120. In the above scheme, when winding the core 110, the rotating shaft can be inserted into the outer shell 121 and bonded, snapped or keyed to the outer shell 121 (the outer shell 121 has an inwardly recessed key structure extending circumferentially, and the rotating shaft has a corresponding groove structure). This makes it easier for the rotating shaft to drive the outer shell 121 to rotate, thereby facilitating the winding of the core 110 around the outer shell 121.

[0100] In some embodiments, the outer peripheral shell 121 is closed at one end and open at the other end. After the step of disengaging the rotating shaft from the outer peripheral shell 121, the following step is further included:

[0101] A first plug body 1212 is prepared; wherein, the first plug body 1212 is provided with an opening.

[0102] A first conductive liquid 123 is prepared, and the first conductive liquid 123 is inserted through an opening in the first plug body 1212. The first conductive liquid 123 can guide the electrolyte 122 by utilizing capillary conduction.

[0103] Electrolyte 122 is injected into the outer shell 121, and the first plug 1212 seals the open opening of the outer shell 121, so that one end of the first liquid 123 is immersed in the electrolyte 122 and the other end extends out of the outer shell 121.

[0104] This scheme can prepare such as Figure 3 The electrode assembly 100 is shown. In this processing scheme, the other parts of the liquid replenishment assembly 120 are assembled after the core 110 is wound. This facilitates the winding of the core 110.

[0105] In some embodiments, after the step of disengaging the rotating shaft from the outer peripheral housing 121, the following step is further included:

[0106] A first plug 1212 and a second plug 1213 are prepared; wherein both the first plug 1212 and the second plug 1213 are provided with openings.

[0107] A first conductive liquid 123 and a second conductive liquid 124 are prepared such that the first conductive liquid 123 passes through an opening in a first plug body 1212 and the second conductive liquid 124 passes through an opening in a second plug body 1213. The first conductive liquid 123 can conduct electrolyte 122 by utilizing capillary conduction, and the second conductive liquid 124 can conduct electrolyte 122 by utilizing capillary conduction.

[0108] The first plug 1212 seals one end of the outer peripheral shell 121.

[0109] Electrolyte 122 is injected into the outer shell 121, and the other end of the outer shell 121 is sealed with the second plug 1213, so that one end of the first liquid conductor 123 is immersed in the electrolyte 122 and the other end extends out of the outer shell 121, and one end of the second liquid conductor 124 is immersed in the electrolyte 122 and the other end extends out of the outer shell 121.

[0110] This scheme can prepare such as Figure 4 The electrode assembly 100 is shown. In this processing scheme, the other parts of the liquid replenishment assembly 120 are assembled after the core 110 is wound. This facilitates the winding of the core 110.

[0111] Similarly, referring to the description in the foregoing embodiments, in some embodiments, the conduction rate of the first conductive liquid 123 is 0.1 g / month to 2.0 g / month; and the conduction rate of the second conductive liquid 124 is 0.1 g / month to 2.0 g / month.

[0112] This application also provides an electrode assembly 100 manufactured using any of the above-described processing methods. This electrode assembly 100 can be any feasible embodiment of the electrode assembly 100 described above. Specifically, the electrode assembly 100 includes a liquid replenishment assembly 120 and a core 110. The liquid replenishment assembly 120 includes an outer shell 121, an electrolyte 122, and a first conductive liquid 123. The outer shell 121 defines a liquid replenishment cavity, in which the electrolyte 122 is contained. One end of the first conductive liquid 123 extends into the liquid replenishment cavity, and the other end extends out of the outer shell 121. The core 110 includes a first diaphragm, a first electrode, a second diaphragm, and a second electrode. The core 110 is wound around the peripheral wall of the outer shell 121. The first conductive liquid 123 is configured to utilize capillary flow to guide the electrolyte 122 out of the liquid replenishment cavity.

[0113] In some embodiments, the size of the outer peripheral shell 121 is equal to the size of the core 110 along the direction of the winding axis of the core 110.

[0114] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A method for processing an electrode assembly, characterized in that, Includes the following steps: Prepare a liquid replenishment assembly; wherein the liquid replenishment assembly includes a cylindrical outer shell, an electrolyte disposed within the outer shell, and a first conductive liquid penetrating the outer shell, the first conductive liquid being able to exhaust the electrolyte within the outer shell through capillary conduction; The first diaphragm, the first electrode, the second diaphragm, and the second electrode are all wound around the outer wall of the outer peripheral shell to form a cylindrical electrode assembly on the outer periphery of the outer peripheral shell. The steps for preparing the fluid replenishment component include: A columnar outer shell is prepared; wherein at least one end of the outer shell is open along the axial direction; A first plug body is prepared; wherein the first plug body has an opening; Prepare a first conductive liquid, and make the first conductive liquid pass through the opening on the first plug body; When one end of the outer shell is sealed and the other end is open, the step of preparing the fluid replenishment assembly further includes: Electrolyte is injected into the outer shell, and the first plug is used to seal the open port of the outer shell, so that one end of the first liquid conductor is immersed in the electrolyte and the other end extends out of the outer shell. When the outer shell is open at both ends, the step of preparing the fluid replenishment assembly further includes: Prepare a second plug body; wherein the second plug body has an opening; A second conductive liquid is prepared, which is then passed through an opening in the second plug body. The second conductive liquid can guide the electrolyte by utilizing capillary conduction. The first plug is used to seal one end of the outer peripheral shell; Electrolyte is injected into the outer shell, and the second plug is used to seal the other end of the outer shell, so that one end of the first conductive liquid is immersed in the electrolyte and the other end extends out of the outer shell, and one end of the second conductive liquid is immersed in the electrolyte and the other end extends out of the outer shell; Before the step of winding the first diaphragm, the first electrode, the second diaphragm, and the second electrode around the peripheral wall of the outer shell to form a cylindrical electrode assembly, the following step is also included: The first diaphragm or the second electrode is adhered to the peripheral wall of the outer shell.

2. A method for processing an electrode assembly, characterized in that, Includes the following steps: A columnar outer shell is prepared, and a rotating shaft is inserted through the outer shell; wherein at least one end of the outer shell is open, the interior of the outer shell is used to store electrolyte, and the electrolyte is adapted to be discharged from one end of the outer shell; The first diaphragm or the second electrode is bonded to the peripheral wall of the outer shell; The rotating shaft is rotated and the outer peripheral shell is driven to rotate, so that the first diaphragm, the first electrode, the second diaphragm, and the second electrode are all wrapped around the peripheral wall of the outer peripheral shell; This causes the rotating shaft to detach from the outer peripheral shell.

3. The electrode assembly processing method as described in claim 2, characterized in that, The outer peripheral shell is closed at one end and open at the other. After the step of disengaging the rotating shaft from the outer peripheral shell, the following steps are also included: A first plug body is prepared; wherein the first plug body has an opening; A first conductive liquid is prepared, which is then inserted through an opening in the first plug body. The first conductive liquid can guide the electrolyte through capillary conduction. Electrolyte is injected into the outer shell, and the first plug is used to seal the open opening of the outer shell, so that one end of the first liquid conductor is immersed in the electrolyte and the other end extends out of the outer shell.

4. The electrode assembly processing method as described in claim 3, characterized in that, After the step of disengaging the rotating shaft from the outer peripheral shell, the following step is also included: A first plug and a second plug are prepared; wherein both the first plug and the second plug are provided with openings; A first conductive liquid and a second conductive liquid are prepared, wherein the first conductive liquid passes through an opening in the first plug body, and the second conductive liquid passes through an opening in the second plug body. The first conductive liquid can guide the electrolyte by means of capillary conduction, and the second conductive liquid can guide the electrolyte by means of capillary conduction. The first plug is used to seal one end of the outer peripheral shell; Electrolyte is injected into the outer shell, and the second plug is used to seal the other end of the outer shell, so that one end of the first conductive liquid is immersed in the electrolyte and the other end extends out of the outer shell, and one end of the second conductive liquid is immersed in the electrolyte and the other end extends out of the outer shell.

5. The electrode assembly processing method as described in claim 4, characterized in that, The conductivity rate of the first conductive liquid is 0.1 g / month to 2.0 g / month; the conductivity rate of the second conductive liquid is 0.1 g / month to 2.0 g / month.

6. An electrode assembly manufactured using any one of the electrode assembly processing methods according to claims 1-5, characterized in that, The electrode assembly includes: A liquid replenishment assembly includes an outer shell, an electrolyte, and a first liquid conductor. The outer shell defines a liquid replenishment chamber, the electrolyte is contained in the liquid replenishment chamber, and one end of the first liquid conductor extends into the liquid replenishment chamber and the other end extends out of the outer shell. The core includes a first diaphragm, a first electrode, a second diaphragm, and a second electrode, and the core is wound around the peripheral wall of the outer shell; The first liquid guide is configured to use capillary flow to draw electrolyte out of the replenishment chamber.

7. The electrode assembly as claimed in claim 6, characterized in that, Along the winding axis of the core, the size of the outer shell is equal to the size of the core.

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